As the title says, the ideologies I made in the Ideology tool can not be used in that tools. They do not appear as an option to use them only vanilla ones.

The mod type vanilla will use your custom ideologies/start dates, that field is there for future usage should integration with things such as Kaiserreich or Old World Blues be added.

I'll look in to adding the custom ideologies into that dropdown list, however, you can type in your ideology into that list (just make sure it's all lowercase), for example "National Syndicalism" becomes "national_syndicalism"

I changed all it to lower case and put the line between in case of two words, but still the vanilla ones are available when I crate a country and want to set leaders.